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# RangeValueIterator

`public interface RangeValueIterator`
``

android.icu.util.RangeValueIterator

Interface for enabling iteration over sets of <int index, int value>, where index is the sorted integer index in ascending order and value, its associated integer value.

The result for each iteration is the consecutive range of <int index, int value> with the same value. Result is represented by <start, limit, value> where

- start is the starting integer of the result range
- limit is 1 after the maximum integer that follows start, such that all integers between start and (limit - 1), inclusive, have the same associated integer value.
- value is the integer value that all integers from start to (limit - 1) share in common.

Hence value(start) = value(start + 1) = .... = value(start + n) = .... = value(limit - 1). However value(start -1) != value(start) and value(limit) != value(start).

Most implementations will be created by factory methods, such as the character type iterator in UCharacter.getTypeIterator. See example below.

Example of use:

     RangeValueIterator iterator = UCharacter.getTypeIterator();
     RangeValueIterator.Element result = new RangeValueIterator.Element();
     while (iterator.next(result)) {
         System.out.println("Codepoint \\u" +
                            Integer.toHexString(result.start) +
                            " to codepoint \\u" +
                            Integer.toHexString(result.limit - 1) +
                            " has the character type " + result.value);
     }

## Summary

### Nested classes
`class` | `RangeValueIterator.Element` Return result wrapper for android.icu.util.RangeValueIterator.

### Public methods
`abstract boolean` | `next(RangeValueIterator.Element element)` Returns the next maximal result range with a common value and returns true if we are not at the end of the iteration, false otherwise.
`abstract void` | `reset()` Resets the iterator to the beginning of the iteration.

## Public methods

### next

    public abstract boolean next (RangeValueIterator.Element element)

Returns the next maximal result range with a common value and returns true if we are not at the end of the iteration, false otherwise.

If this returns a false, the contents of elements will not be updated.

Parameters
`element` | `RangeValueIterator.Element`: for storing the result range and value

Returns
`boolean` | true if we are not at the end of the iteration, false otherwise.

See also:

- `RangeValueIterator.Element`

### reset

    public abstract void reset ()

Resets the iterator to the beginning of the iteration.

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